中国生态农业学报2012，Vol.20Issue(9)：1197-1203,7.DOI:10.3724/SP.J.1011.2012.01197
黄土丘陵半干旱区人工柠条林土壤固碳特征及其影响因素
Soil carbon sequestration characteristics of Caragana microphylla plantations and influencing factors in Loess Hilly Semiarid Region
摘要
Abstract
Using spatio-temporal substitution method, this study analyzed soil organic carbon (SOC), soil total nitrogen (STN), soil total phosphor (STP), root biomass and litter biomass of Caragana microphylla plantations of different ages. Soil carbon content change characteristics under C. microphylla plantations and the influencing factors in the Loess Hilly Semiarid Region were discussed It threw further light on soil carbon mechanisms under C. microphylla plantations. The results suggested that at 0-60 cm soil profile, SOC content steadily decreased with soil depth increasing. Also SOC content in the 0~20 cm soil layer was higher than that in the other soil layers. At 0~20 cm soil layer, SOC content was 2.68~11.44 g·kg-1. At 40~60 cm soil depth, however, SOC content fluctuated only minimally and was 1.64~2.73 g·kg-1. Compared with two-year abandoned sloping farmland (CK), variations in average SOC content under C. microphylla at 0~60 cm soil depth initially decreased and then increased before finally stabilizing with time. At C. microphylla ages 10 and 17, SOC content significantly decreased by 34.5% and 26.9%, respectively, compared with that in CK. At C. microphylla age 26, SOC content significantly increased, which was 1.43 times as that in CK. Ac C microphylla ages 40 and 50, however, SOC content was in the state that accumulation and consumption of SOC was relatively siable. Correlation analysis showed that SOC was significanily correlated with STN root biomass and litter biomass. However, there was no correlation between SOC and STP contents. The results indicated that soil carbon sequestration capacity increased by increasing soil total nitrogen content. Both the amounts of root biomass and litter biomass dictated soil carbon sequestration degree.关键词
黄土丘陵区/柠条林地/土壤有机碳/土壤全氮/土壤全磷/根系生物量/枯落物现存量Key words
Loe33 Hilly Region, Caragana microphylla plantations, Soil organic carbon, Soil total nitrogen, Soil total phosphorus, Root biomass, Litter biomass分类
农业科技引用本文复制引用
崔静,陈云明,黄佳健,王琼芳,姚志杰,张飞..黄土丘陵半干旱区人工柠条林土壤固碳特征及其影响因素[J].中国生态农业学报,2012,20(9):1197-1203,7.基金项目
中国科学院战略性先导科技专项(XDA05050203)和中国科学院百人计划项目(kzcx2-yw-BR-02)资助 （XDA05050203）
